Move mojo/public/c/gpu/* to mojo/public/c/include.

mojo/public/c/gpu/MGL/mgl_echo.h

Index: mojo/public/c/gpu/MGL/mgl_echo.h
diff --git a/mojo/public/c/gpu/MGL/mgl_echo.h b/mojo/public/c/gpu/MGL/mgl_echo.h
deleted file mode 100644
index 1b9285cbec6d7a1e437cd05e096bf1f39357ebbc..0000000000000000000000000000000000000000
--- a/mojo/public/c/gpu/MGL/mgl_echo.h
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Note: This header should be compilable as C.
-
-#ifndef MOJO_PUBLIC_C_GPU_MGL_MGL_ECHO_H_
-#define MOJO_PUBLIC_C_GPU_MGL_MGL_ECHO_H_
-
-#include <stdint.h>
-
-#include "mojo/public/c/gpu/MGL/mgl_types.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef void (*MGLEchoCallback)(void* closure);
-
-void MGLEcho(MGLEchoCallback callback, void* closure);
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif
-
-#endif  // MOJO_PUBLIC_C_GPU_MGL_MGL_ECHO_H_